Exercise books on functional analysis

Try Exercises in Functional Analysis by Constantin Costara and Dumitru Popa.

The book M. Fabian, P. Habala, P. Hajek, V. Montesinos, V. Zizler: Banach Space Theory. The Basis of Linear and Nonlinear Analysis has plenty of exercises at the and of each chapter.

Google Books link, MR2766381 (2012h:46001), Zbl 1229.46001.